A surveillance operator struggles to keep her team from falling apart as they pursue the crime syndicate that murdered her brother during an unsanctioned operation.

This is interesting but I think it is a little unclear if the 'unsanctioned operation' is the pursuit that the surveillance operator is leading, or the murder of her brother. Perhaps it is the use of 'during' that is confusing. Having said that, I think the stakes and the story are compelling.

Haven't seen 'The Black Windmill' but like Michael Caine.

Was reading the logline of "The Black Windmill" with Michael Caine shown tonight at 21:00 on ITV4, and thought of your script. Never seen that movie, so can't say more that the logline seems interesting.
Here is the logline.
A British agent's son is kidnapped and held for a ransom of diamonds. The agent finds out that he can't even count on the people he thought were on his side to help him, so he decides to track down the kidnappers himself.